The discovery of aging blemishes on microfilm in storage has prompted a study of the statistical relationship of incidence to conditions of preparation and storage, the chemical and physical nature of the blemishes, and measures to be taken to prevent the Topics: Documents on microfilm., Microfilms--Deterioration.
In this work we did complete technical studies at the level of the territory of Zahrez by imposing on a protection of the region from natural hazards, which are caused due to the deterioration of the natural environment. To reduce these risks, based on the study of hydrology and geology we have proposed a policy of reforestation "Green Dam" and that because of its importance of the fertility of the soil to reduce the phenomenon of desertification and floods, that consists on fixing... Topics: Zahrez, Natural, Desertification, Détérioration and Sands
Pavement is a multi-layer system that distributes the vehicular loads over a larger area. It helps to make them durable and able to withstand traffic and the environment. Pavement consists of three basic layers the first layer is Sub grade (Gravel) which is the foundation layer, the second layer is sub base (layer Assistant foundation) and the top layer is base (a layer of pavement) which consists of Bituminous Carpet + Bituminous Macadam. Cracking of pavement is a defect that appears in the... Topics: Crack, Pavement distress, road maintenance, Pavement deterioration.